I had the Pioneer 10in flat powered by a smaller MTX terminator, running 214watts. There is a speaker box company in Clearwater that sells them through an ebay store and on their website. Brightstar Car Audio. Cost me about $85 shipped and they carpeted it in black. Fit very well and was built solid.
I didnt have a need for two subs, i just had one. The best option.....if you can find it, was the Rockford/saleen box that was optional on the S331 truck back in 07-08. Rockford used to sell them through an ebay store, i think they have all disappeared. Unless you find one with a Rockford badge and Pioneer flat woofer already in it...then its mine and was stolen out of my truck in 2011.....so, i had to get a new system